diff --git a/core/src/main/resources/lib/c/reactor-c b/core/src/main/resources/lib/c/reactor-c
index 3d7715c39f..9ac135a8b6 160000
--- a/core/src/main/resources/lib/c/reactor-c
+++ b/core/src/main/resources/lib/c/reactor-c
@@ -1 +1 @@
-Subproject commit 3d7715c39fc40ad3c4c29918e724dc5b96738ca5
+Subproject commit 9ac135a8b6fc86908b2381ae0664cdd8f07b2eb0
diff --git a/test/C/src/FilePkgReader.lf b/test/C/src/FilePkgReader.lf
index d8bf41d9d6..ced5435d0b 100644
--- a/test/C/src/FilePkgReader.lf
+++ b/test/C/src/FilePkgReader.lf
@@ -6,7 +6,7 @@ reactor Source {
 
   reaction(startup) -> out {=
     char* file_path =
-      LF_PACKAGE_DIRECTORY
+      LF_STRINGIFY(LF_PACKAGE_DIRECTORY)
       LF_FILE_SEPARATOR "src"
       LF_FILE_SEPARATOR "lib"
       LF_FILE_SEPARATOR "FileReader.txt";
diff --git a/test/C/src/FileReader.lf b/test/C/src/FileReader.lf
index e802baf115..473b47999c 100644
--- a/test/C/src/FileReader.lf
+++ b/test/C/src/FileReader.lf
@@ -6,7 +6,7 @@ reactor Source {
 
   reaction(startup) -> out {=
     char* file_path =
-      LF_SOURCE_DIRECTORY
+      LF_STRINGIFY(LF_SOURCE_DIRECTORY)
       LF_FILE_SEPARATOR "lib"
       LF_FILE_SEPARATOR "FileReader.txt";
 
diff --git a/test/C/src/federated/FederatedFilePkgReader.lf b/test/C/src/federated/FederatedFilePkgReader.lf
index cf79291acf..c29358c83e 100644
--- a/test/C/src/federated/FederatedFilePkgReader.lf
+++ b/test/C/src/federated/FederatedFilePkgReader.lf
@@ -8,7 +8,7 @@ reactor Source {
 
   reaction(startup) -> out {=
     char* file_path =
-      LF_PACKAGE_DIRECTORY
+      LF_STRINGIFY(LF_PACKAGE_DIRECTORY)
       LF_FILE_SEPARATOR "src"
       LF_FILE_SEPARATOR "lib"
       LF_FILE_SEPARATOR "FileReader.txt";
diff --git a/test/C/src/federated/FederatedFileReader.lf b/test/C/src/federated/FederatedFileReader.lf
index 617d34c3c8..91585502e5 100644
--- a/test/C/src/federated/FederatedFileReader.lf
+++ b/test/C/src/federated/FederatedFileReader.lf
@@ -9,7 +9,7 @@ reactor Source {
 
   reaction(startup) -> out {=
     char* file_path =
-      LF_SOURCE_DIRECTORY
+      LF_STRINGIFY(LF_SOURCE_DIRECTORY)
       LF_FILE_SEPARATOR ".."
       LF_FILE_SEPARATOR "lib"
       LF_FILE_SEPARATOR "FileReader.txt";